An introduction to Cisco 1000BASE-SX SFP And Cisco 1000BASE-LX SFP Transceiver | by Emily Twain | Medium
1000BASE-SX SFP Multimode VS. 1000BASE-LX SFP Single-modeFiber Optic Components
What is the difference between LX and SX in transceiver? | Cozlink
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1000Mbps 4 Port Online SFP Fiber Optic Transceiver Module SX/LX Data Buffer 256K